1.判斷字符串中是否包含中文

- (BOOL)isContainChinese
{
    for (int i = 0; i < self.length; i++) {
        unichar ch = [self characterAtIndex:i];
        if (0x4E00 <= ch  && ch <= 0x9FA5) {
            return YES;
        }
    }
    return NO;
}

2.將字符串中的中文編碼

-(NSString *)stringByUrlEncodingChinese
{
    // 不包含中文，直接返回
    if (![self isContainChinese]) {
        return self;
    }
    // 取出字符串中的中文，以及中文符號(hào)。
    NSString *ChineseStr = @"";
    for (int i = 0 ; i < self.length; i ++) {
        NSString *str =[self substringWithRange:NSMakeRange(i, 1)];
        for (int j = 0 ; j < str.length; j++) {
            unichar ch = [str characterAtIndex:j];
            if (0x4E00 <= ch  && ch <= 0x9FA5) {
                ChineseStr = [ChineseStr stringByAppendingString:str];
                break;
            }
        }
    }
    NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:ChineseStr] invertedSet];
    return [self stringByAddingPercentEncodingWithAllowedCharacters:set];
}

3.test

NSLog(@"%@",[@"index.html#/漢字/?value=1&key=2/中文符號(hào)！@#￥%……&*（）？》《：“｜」「【】/English!@#$^&*(){}|<>?:" stringByUrlEncodingChinese]);

輸出結(jié)果

index.html#/%E6%B1%89%E5%AD%97/?value=1&key=2/%E4%B8%AD%E6%96%87%E7%AC%A6%E5%8F%B7%EF%BC%81@#%C2%A5%%E2%80%A6%E2%80%A6&*%EF%BC%88%EF%BC%89%EF%BC%9F%E3%80%8B%E3%80%8A%EF%BC%9A%E2%80%9C%EF%BD%9C%E3%80%8D%E3%80%8C%E3%80%90%E3%80%91/English!@#$^&*(){}|<>?: